Enables protease binding activity and transmembrane transporter binding activity. Involved in prepulse inhibition. Located in several cellular components, including main axon; neuronal cell body; and synaptic membrane. Used to study autism spectrum disorder and visual epilepsy. Human ortholog(s) of this gene implicated in several diseases, including Pitt-Hopkins syndrome; autism spectrum disorder (multiple); communication disorder (multiple); cortical dysplasia-focal epilepsy syndrome; and social phobia. Orthologous to human CNTNAP2 (contactin associated protein 2). [provided by Alliance of Genome Resources, Apr 2022]